Snowplow



Nov. 9,1926. 1,606,057

' R. E. CHOATE ET AL SNOWPLOW Filed DSC. 29, 1924 Mnwmtow @Romand Patented Nov. 9, `1926.

UNITED STATESl PATENT OFFICE. A

ROY E. CHOATE, F CEDAR RAPIDS, IOWA, AND FREDBICK vG'. LEWIS, 0F ST. LOUIS,

' MISSOURI.

slsrowrnow.` i

' Application med December 29, 1924. Serial No. 758,537.

This invention relates to heavy duty snow plows of the type shown in the application of Roy E. Choate for patent for snow plows No. 682,578 filed on `the 24th of December 1923. The object of this invention is to provide for a quick lift of the side wings of the plow by means of a hydraulic jack.

In the former application above referred to the hydraulic 'jack was shown as applied to the nose of the plow, the side win being raised by means of a block and tac e. In practice it is desirable to employ a hydraulic lifting apparatusnot only for the reason given above but alsoA because it relieves the operatorof practicall all manual labor.

The invention is fu l set forth in the dev scription and claims fo lowing, reference being had to the accompanying drawing, in which Fig. 1 is a side elevation illustrating the improved hoisting mechanism as applied to a snow plow, the propelling tractor not being shown.

Fig. 2 is a fragmentary plan view illustrating conventionally the mechanism for operating the hydraulic jack.

Fig. 3 is a view in perspective illustratin details in the mounting of the side wings o the plow.

Referring to the drawing the numeral 5 denotes the main-frame of the plow carried on runners 6 and connected at the rear end by a transverse draw-bar 7. A swing-frame 8 carries at its forward, converging'end the V-shaped nose of the plow 9. Just at the rear of this the main-frame is provided with an upstanding allows `frame 10, the main purpose of whic is to serve asa su port for the hoisting apparatus now to be escribed.

To the side post 10a is secured an outstanding vertical guide-rod 11. On this is mounted slidably a. yoke 12 and to this yoke is pivoted at L13 the front end ofthe side wing ld. To the upper end of the yoke is attached a cable 15 running over a sheave 16 mounted on a bracket 17 at the upper end of the gallows frame. The other end of the cable connects with a slide-bar 18 ierced with a number el holes as shown. through a slot in a cross-head 19 sldable up and'down on the frame and attached to the pistonrod 2O of the hydraulic jack 21 secured tothe frame. To the'other end of the cross head is attached another cable 22,

his slide bar passesl the opposite end of which is attached to the slde wing at 23. It will be evident from the foregoing that 1f high pressure liquid (oil, preferably) is forced into the upper end of the jack cylinder the cross-head will be forced downwardly, correspondingly elevating the rear end of the plow side wing. The front end of said wing may also be elevated in the same manner and at the same time and to any desired extent by inserting in any one of the holes in the slide-bar below the cross-head a pin 24. The descent of the cross-head to an extreme point will 5f course elevate the front end of the plow wing according to the location of the pin.

The mounting of the side wing at the rear is fully described in the application above referred'to to which more particular reference may be had.A Described briedy it cornprises a pair of telescopic struts 25 connect'- lng at one end with the main frame by universal joints 26 and similarly connectlng at the other end with a vertical cross-head 27 mounted slidably on a pair-of guide-rods 28 attached at each end to the side wing of the plow. In practice these'struts 'are of tubular cylindrical steel and are provided with a serles of holes to take a 'locking pin, whereby the angle of the wing to the main frame may be var1ed at pleasure and to any desired extent. It is to be noted that in the lifting of the wing the struts are necessarily subjected to a twisting strain, the circular cross section of the telescoping arts of the strut allowing for this twist as the wing is moved up and down.

In Fig. 2 the means for supplying the j ack with oil is illustrated conventionally. lit is to be understood that for this and analogous lpurposes the tractor used in connection with `this plow is equipped with an oil tank and pump by which liquid under high pressure may be supplied to the jack. lin Fig. 2 this tank is designated by the numeral 29 and adjacent to it is a force pump 30. From one side of the pump extends a pressure pipe 31,

which in this embodiment of the invention connects with arnanifold 32 and from this manifold pipes 33, 3d and 35 extend'for- -wardl' to serve the various jacks used in 4the p ow. rllhe first' of the abovewill be seen to connect with the jack shown at the lower side of the gure; the second one is supposed to connect with a similar jack on the other side of the machine, and the last named is supposed to serve a jack for the nose of the-plow not shown. Each of these pipes is supplied with a threeway valve 36 from each of which a relief pipe 37 connecting with a manifold 38jreturns the spent oil to the tank or pump through a pipe 39. The pump is supposed to be in continuous operation and the excess pressure due to such operation is compensated for by a pressure valve 40 connecting with a by-pass 41 back to the tank or pump.

These various control valves are supposed to be within easy access of the operator of the tractor andby their use the nose or wings of the plow may be elevated or depressed at pleasure, singly or simultaneously.

Having thus described our invention we claim 1. In a power driven snow plow, a main supporting frame provided with an upstanding gallows frame, a side wing connecting pivotally and slidably thereto, a hydraulic jack mounted on said gallows. lifting cables connecting forwardly and rearwardly with said wing, sheaves for said cables, a cross head attached to the lpiston of the jack and to each of said cables.

2. In a power driven snow plow provided with an upstanding gallows frame to carry a side wing, a side wing pivoted at its forward end to a sliding yoke, a guide for said yoke, a hydraulic jack mounted on the gallows, means for supplying said jack with high pressure liquid, a cross head carried by its piston, a lifting'cable attached atv one end to said cross head and the other end to the yoke, another lifting cable connecting the cross head with the wing rearwardly and sheaves carrying said cables.

3.- In a power driven snow plow having an upstanding, side wing carrying frame, a hydraulic jack attached to said frame and having a thrust cross head attached to its piston, a. cable connecting said cross head over a sheave with the side wing and rearwardly and liftably, a yoke carrying the front end of the wing slidably, a guide therefor, a slide-bar in operative connection with the cross head and provided with means for connecting with the cross head adjustably, a cable attached to the slide bar at one end and to the `yoke at the other and a sheave carrying said cable.

4. In a power driven snow plow having an upstanding frame toA support a side wing, a yoke slidable with respect to said frame, a side wing pivoted at its forward end to said yoke, twistable telescopic struts, connecting the wing with the main frame, a hydraulic jack, means for supplying liquid under pressure thereto and means connecting the thrust member of the jack with thc wing fore and aft.

5. In combination with the lftable and -tiltable side wing of a snow plow, a hydraulic jack, means connecting the thrust meniber of the jack with the wing fore and aft and means for supplying the jack with liquid underepressure, the same comprising aforce pump, a pressure pipe line extending therefrom to the jack, a three-way valve in said pipe line, a return pipe line leading from the valve to the other side of the pump and a by-pass connecting the pipe lines both Sides of the pump, with the pressure valve therein.`

j6. In a snow-plow having plow members adapted to be raised and lowered, the conibination of an oil-operated system for effecting this raising and lowering, comprising the combination of a cylinder controlling a plow member, an oil supply tank, a

pump, a suction pipe leading from the tank to the pump, a discharge pipe leading from the pump to the cylinder, a return pipe leading from the discharge pipe to the suction ipe, and a three-way valve situated at the Junction of the discharge pipe and the return pipe. t

7. In a snow-plow having4 plow members adapted to be raised and lowered, the combination of an oil-operated system for effecting this raising and lowering, comprising a plow-member controlling cylindernan oil supply tank, a pump, a discharge pipe leading from the pump to the cylinder, a return pipe to conduct the oil from the cylinder to the tank, and a valve in operative relation to the discharge and return pipes. and adapted to shift the oil-flow* to and from the cylinder.

In testimony whereof we. aflix our -slgnatures.

ROY E. CHOATE. FRED G. LEWIS. 

